https://bugs.kde.org/show_bug.cgi?id=414903
Bug ID: 414903
Summary: Optimize/free unused canvas space in all layers
Product: krita
Version: 4.2.8
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: b...@beuc.net
Target Milestone: ---
Krita may store oversized layers (lots of empty space around the actual
drawing).
For instance: create a 4K image, draw a small circle in the center, then draw
in Erase mode in the corner of the layers: full 4k layer for a dot. This can be
easily verified in the layer's hover preview (initially cropped to the circle,
then a dot with large margins all around). There are other situations where
Krita does not properly optimize the drawing space on-the-fly.
This can lead to several GB of memory, notably when such a layer is duplicated
(copy-n-edit, animations...).
This are hard to track down for the end user (took me a while to figure out),
who is lead to believe Krita is just a buggy memory hog ;)
To reclaim the RAM (and reduce the on-disk document size), a work-around is to
crop each layer individually, but with complex documents this takes forever,
and this may need to be done several time over the life of the painting.
A no-op "Layers > Transform all layers > Scale" with the exact same size does
help, though it doesn't crop the empty spaces in all situations; moreover this
is a manual step that requires prior understanding of this issue.
I would suggest auto-cropping all layers _on save_.
This would prevent the issue and avoid manually optimizing one's documents.
What do you think?
If that sounds reasonable I could work on a patch.
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